ELECTRIC CIRCUIT PRESENTATION

Group members:

Md. Kamrul Hasan (161-15-6817)

Md. Sahadatunnobi Chowdhury (161-15-7581)

Md. Rezaur Rahman (161-15-6782)

Md. Sakhawat Hossain (161-15-6953)

Md. Ayub Shamim (161-15-6717)

Group name: VOLTMETER

DEFINITION OF A MESH

Mesh– the smallest loop around a subset of components in a circuit.

Multiple meshes are defined so that every component in the circuit belongs to one or more meshes

i1

i2

+ V1

_

Vin

+ V3

_

+ V5

_

+ V6

_

+ V2 -

+ V4 -

MESH ANALYSIS

Technique to find voltage drops around a loop using the currents that flow within the loop, Kirchoff’s Voltage Law, and Ohm’s.

Law First result is the calculation of the mesh currents.

Which can be used to calculate the current flowing through each component.

Second result is a calculation of the voltages across the components.

Which can be used to calculate the voltage at the nodes.

PROCEDURE OF MESH ANALYSIS

Identify all the loops in the circuit

Label the current flowing in mesh

In each mesh label the voltage each component in the circuit

Use Kirchhoff's voltage law

Use ohms law to relate the voltage drops across each components

PROCEDURE OF MESH ANALYSIS

Solve the mesh currents i1 and i2.this currents are related to the current found during the nodal analysis.

If we know I1,I2........... we can know all components voltage

CURRENT DIVIDER RULE(CDR)

Current divider rule is applicable in parallel circuit.

Part of total current will flow through each of the resistance in a parallel circuit.

A current divider is a simple linear circuit that produces an output current (IX) that is a fraction of its input current (IT).

CURRENT DIVIDER RULE(Image)

MATH SOLVE (Using CDR)

24 A

=2 Ω =3 Ω =6 Ω

KIRCHHOFF'S CURRENT LAW

INTRODUCTION OF KCL

It is fundamental laws.

KCL is conservation of electrical energy.

Analysis of any circuit.

CURRENT DIRECTION

PROBLEM SOLVE OF KCL

SUPERPOSITION THEOREM

The super position theorem extends the use of Ohm’s law to circuits with multiple sources.

Definition : The current through or voltage across and element in a linear bilateral network equal to the algebraic sum of the current or voltages produced independently by each source.

PROCEDURE OF SUPERPOSITION

To ascertain the contribution of each individual source all of the other sources must be “ turned off”.

Replacing all other independent voltage source with a short circuit.

Replacing all other independent current sources with an open circuit .

APPLICABLE AREA OF SUPERPOSITION

The theorem is applicable to linear networks consisting of independent sources, linear dependent sources, passive elements and linear transformers.

Another point that should be considered is that superposition only works for voltage but not for power.

THEVENINE THEOREM

A linear two terminal circuit can be replaced with an equivalent circuit of an ideal voltage source Vth , in series with a resistor Rth.

Vth is the equal to the open circuit voltage at the terminals.

Rth is the equivalent or input resistance when the inpendent sources in the linear circuits are turned off.

PROCEDURE OF APPLYING THEVENINE

Find Rth:

First low resistance of the circuit Rl is identified and removed.

All independent voltage and current sources should be off.

If there is voltage source we have to short this source.

If there is current source we have to open current source.

PROCEDURE OF APPLYING THEVENINE

Now we apply Req to find Rth.

Find Vth:

Low resistance of the circuit Rl is identified and removed.

We measure voltage in this place and measure Vth.

THANK YOU !